“Who knew Canadians could be so cheeky?” tweeted Paul Graham, one of the founders of San Francisco-based tech accelerator Ycombinator last month. The tweet accompanied a picture of a billboard, looming above the 101 highway. “H-1B problems?” It commiserated. “Pivot to Canada. New Start-Up Visa. Low taxes.” Canada is surfing Silicon Valley’s neighbourhood, looking for immigrant talent. But if we get it, can we kee....Read More